arch/powerpc/platforms/ps3/time.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  PS3 time and rtc routines.
   4  *
   5  *  Copyright (C) 2006 Sony Computer Entertainment Inc.
   6  *  Copyright 2006 Sony Corp.
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/platform_device.h>
  11 #include <linux/rtc.h>
  12
  13 #include <asm/firmware.h>
  14 #include <asm/lv1call.h>
  15 #include <asm/ps3.h>
  16
  17 #include "platform.h"
  18
  19 void __init ps3_calibrate_decr(void)
  20 {
  21         int result;
  22         u64 tmp;
  23
  24         result = ps3_repository_read_be_tb_freq(0, &tmp);
  25         BUG_ON(result);
  26
  27         ppc_tb_freq = tmp;
  28         ppc_proc_freq = ppc_tb_freq * 40;
  29 }
  30
  31 static u64 read_rtc(void)
  32 {
  33         int result;
  34         u64 rtc_val;
  35         u64 tb_val;
  36
  37         result = lv1_get_rtc(&rtc_val, &tb_val);
  38         BUG_ON(result);
  39
  40         return rtc_val;
  41 }
  42
  43 time64_t __init ps3_get_boot_time(void)
  44 {
  45         return read_rtc() + ps3_os_area_get_rtc_diff();
  46 }
  47
  48 static int __init ps3_rtc_init(void)
  49 {
  50         struct platform_device *pdev;
  51
  52         if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
  53                 return -ENODEV;
  54
  55         pdev = platform_device_register_simple("rtc-ps3", -1, NULL, 0);
  56
  57         return PTR_ERR_OR_ZERO(pdev);
  58 }
  59 device_initcall(ps3_rtc_init);